Daily intake of inorganic arsenic and some organic arsenic species of Japanese subjects

► Inorganic and organic arsenic species in duplicated diet samples of Japanese subjects were analyzed. ► A high-sensitivity LC-ICP-MS system with hydride generation was employed. ► Daily inorganic arsenic intake was estimated to be 2-57 μg/d with a large intra- and inter-population variation. ► Skin, liver and lung cancer risks derived from daily inorganic arsenic of Japanese exceeded 10E-5 and it was not negligible.